Substrate-level phosphorylation is the direct transfer of a phosphate group from a high-energy substrate molecule to ADP to form ATP. This process does not require oxygen and occurs in the cyt

Here's the difference between substrate-level phosphorylation and oxidative phosphorylation:

• Substrate-level phosphorylation is the direct transfer of a phosphate group from a high-energy substrate molecule to ADP to form ATP. This process does not require oxygen and occurs in the cytoplasm during glycolysis and in the mitochondrial matrix during the Krebs cycle.
• Oxidative phosphorylation is an indirect method of ATP synthesis that involves the electron transport chain and chemiosmosis. It requires oxygen as the final electron acceptor and occurs on the inner mitochondrial membrane, driven by a proton gradient.